Potassium in the soil
Potassium (K +) in the soil is in three forms:
→ inside the clays and which is inaccessible to plants
→ in the clay-humic complex, that is, as reserve potassium
→ in solution directly assimilable by the roots
Behavior of the mineral potassium
When mineral potassium is applied via the roots, only a part will be placed as exchangeable potassium (complexed potassium) that passes into the soil solution, where it is absorbed by the roots. Most of the mineral K + remains fixed inside the clays where it is immobilized.
Potassium behavior of organ K
Due to the molecular structure of organ K, the electrostatic attraction between potassium and the surface of the clay and humus particles is favored, thus increasing the concentration of exchangeable potassium in the soil in solution. Its fixation inside the clays and its loss by leaching in sandy soils are significantly reduced.